Rio Olympics 2016: Christine Ohuruogu may retire after failing to qualify for the 400m final
Great Britain's Christine Ohuruogu hinted she will retire from athletics after failing to qualify for the 400m final at the Rio Olympics.
The 32-year-old won gold at the Beijing Games in 2008, and silver at London four years later.
However, she came fifth in her semi-final on Sunday, and afterwards told BBC Sport she is "getting old".
"I think it's one minute to midnight and this girl is about to turn into a pumpkin," she said.
"I think it's coming to an end, training is getting harder.
"I have been stuck in one gear all season. I am disappointed but I am happy I made it this far. These girls are fit and I wasn't able to compete with them."
Compatriot Emily Diamond also failed to make the final, finishing sixth in the second semi-final.
In the 1500m, Scot Laura Muir matched 2015 world champion Genzebe Dibaba to qualify for the final, finishing third in the second semi-final.
Laura Weightman took the fifth qualifying spot from the first semi-final, but suffered a gash on her right shin which she said afterwards may need stitches.
And in the high jump, London 2012 bronze medallist Robbie Grabarz qualified for Tuesday's final, but team-mate Chris Baker missed out.